Mössbauer study of 57Fe in CVD diamond following 57Mn implantation

Bharuth-Ram, K.; Naicker, V. V.; Naidoo, D.; Gunnlaugsson, H. P.; Mantovan, R.; Weyer, G.; Dietrich, M.; Butler, James E.

doi:10.1007/s10751-008-9669-x

Cited by 3 publications

(1 citation statement)

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“…In comparison to 57* Fe Mössbauer studies which use long-lived 57 Co (271 d) sources, both in absorption and emission mode, the short half life of 57 Mn in combination with the high beam intensity available at ISOLDE (up to 4×10 8 atoms/s corresponding to ~60 pA) allow for several orders of magnitude faster data taking, making it possible to record hundreds of Mössbauer spectra per day, which is not possible in any other radioactive ion beam facility. Since then, 57 Mn→ 57 Fe Mössbauer experiments have been undertaken in a large variety of semiconductors and oxides during the last couple of years, with a focus on Si, Si x Ge 1−x [18], diamond [19] and especially ZnO [20][21][22][23] but also in some geological sampes [24].…”

Section: Mössbauer Effectmentioning

confidence: 99%

Materials science and biophysics applications at the ISOLDE radioactive ion beam facility

Wahl

2011

Nuclear Instruments and Methods in Physics Research Section B:

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The ISOLDE isotope separator facility at CERN provides a variety of radioactive ion beams, currently more than 800 different isotopes from ~65 chemical elements. The radioisotopes are produced on-line by nuclear reactions from a 1.4 GeV proton beam with various types of targets, outdiffusion of the reaction products and, if possible, chemically selective ionisation, followed by 60 kV acceleration and mass separation. While ISOLDE is mainly used for nuclear and atomic physics studies, applications in materials science and biophysics account for a significant part (currently ~15%) of the delivered beam time, requested by 18 different experiments. The ISOLDE materials science and biophysics community currently consists of ~80 scientists from more than 40 participating institutes and 21 countries. In the field of materials science, investigations focus on the study of semiconductors and oxides, with the recent additions of nanoparticles and metals, while the biophysics studies address the toxicity of metal ions in biological systems. The characterisation methods used are typical radioactive probe techniques such as Mössbauer spectroscopy, perturbed angular correlation, emission channeling, and tracer diffusion studies. In addition to these "classic" methods of nuclear solid state physics, also standard semiconductor analysis techniques such as photoluminescence or deep level transient spectroscopy profit from the application of radioactive isotopes, which helps them to overcome their chemical "blindness" since the nuclear half life of radioisotopes provides a signal that changes in time with characteristic exponential decay or saturation curves. In this presentation an overview will be given on the recent research activities in materials science and biophysics at ISOLDE, presenting some of the highlights during the last five years, together with a short outlook on the new developments under way.

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Section: Mössbauer Effectmentioning

confidence: 99%

Materials science and biophysics applications at the ISOLDE radioactive ion beam facility

Wahl

2011

Nuclear Instruments and Methods in Physics Research Section B:

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Lattice sites, charge states and spin–lattice relaxation of Fe ions in 57 Mn + implanted GaN and AlN

Masenda

Naidoo

Bharuth-Ram

et al. 2016

Journal of Magnetism and Magnetic Materials

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The lattice sites, valence states, resulting magnetic behaviour and spin-lattice relaxation of Fe ions in GaN and AlN were investigated by emission Mössbauer spectroscopy following the implantation of radioactive 57 Mn + ions at ISOLDE/CERN. Angle dependent measurements performed at room temperature on the 14.4 keV γ-rays from the 57 Fe Mössbauer state (populated from the 57 Mn β − decay) reveal that the majority of the Fe ions are in the 2+ valence state nearly substituting the Ga and Al cations, and/or associated with vacancy type defects. Emission Mössbauer spectroscopy experiments conducted over a temperature range of 100-800 K show the presence of magnetically-split sextets in the "wings" of the spectra for both materials. The temperature dependence of the sextets relate these spectral features to paramagnetic Fe 3+ with rather slow spin-lattice relaxation rates which

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